A silicone O-ring was added around the opening to the herb chamber to prevent material from getting trapped and to reduce or eliminate the possibility of dislodging the screen from its original position.
A small rubber washer was added at the base of the battery hole to provide some resistance that prevents accidental battery contact. With this ring in place, you have to apply pressure to make contact and heat up the screen. These rings can be retrofitted into units without them and are available from the Online Store. The push-back ring requires a firm pressure and could be problematic for users with arthritic or otherwise weakened hands. If you don't like the ring it can be removed with a pair of tweezers.
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